Fans might not be as grand as your growth system, they may not be as alchemically appealing as brewing up nutrient solutions and they’re definitely not as sexy as reflectors (just me then?); but they are undeniably essential.

Getting your extraction system right takes a little maths and a little time, which can be galling to newcomers. But never fear, HYDROMAG is here to break it down into bite sized chunks and hold your hand through the vaguely traumatic process.

To start with, you could do with a basic understanding of the habits of air and its relation to temperature and high and low pressure within the Earth’s atmosphere; or you could just take it as read that hot air goes up and cold air goes down. Your bulbs give off heat, which you want to reduce, so it helps to have your extractor fan near your bulbs. Common practice see’s most people placing extraction at the top of the room, and the intake towards the bottom.